docs: def vault_relation_complete(backend=None):
      """Determine whether vault relation is complete
  
      :param backend: Name of secrets backend requested
      :ptype backend: string
      :returns: whether the relation to vault is complete
      :rtype: bool"""
      vault_kv = VaultKVContext(secret_backend=backend or VAULTLOCKER_BACKEND)
      vault_kv()
      return vault_kv.complete